This file is indexed.

/usr/share/gromacs/top/elements.dat is in gromacs-data 2018.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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???  H      1  
???  He     2  
???  Li     3  
???  Be     4  
???  B      5  
???  C      6  
???  N      7  
???  O      8  
???  F      9  
???  Ne    10  
???  Na    11  
???  Mg    12  
???  Al    13  
???  Si    14  
???  P     15  
???  S     16  
???  Cl    17  
???  Ar    18  
???  K     19  
???  Ca    20  
???  Sc    21  
???  Ti    22  
???  V     23  
???  Cr    24  
???  Mn    25  
???  Fe    26  
???  Co    27  
???  Ni    28  
???  Cu    29  
???  Zn    30  
???  Ga    31  
???  Ge    32  
???  As    33  
???  Se    34  
???  Br    35  
???  Kr    36  
???  Rb    37  
???  Sr    38  
???  Y     39  
???  Zr    40  
???  Nb    41  
???  Mo    42  
???  Tc    43  
???  Ru    44  
???  Rh    45  
???  Pd    46  
???  Ag    47  
???  Cd    48  
???  In    49  
???  Sn    50  
???  Sb    51  
???  Te    52  
???  I     53  
???  Xe    54  
???  Cs    55  
???  Ba    56  
???  La    57  
???  Ce    58  
???  Pr    59  
???  Nd    60  
???  Pm    61  
???  Sm    62  
???  Eu    63  
???  Gd    64  
???  Tb    65  
???  Dy    66  
???  Ho    67  
???  Er    68  
???  Tm    69  
???  Yb    70  
???  Lu    71  
???  Hf    72  
???  Ta    73  
???  W     74  
???  Re    75  
???  Os    76  
???  Ir    77  
???  Pt    78  
???  Au    79  
???  Hg    80  
???  Tl    81  
???  Pb    82  
???  Bi    83  
???  Po    84  
???  At    85  
???  Rn    86  
???  Fr    87  
???  Ra    88  
???  Ac    89  
???  Th    90  
???  Pa    91  
???  U     92  
???  Np    93  
???  Pu    94  
???  Am    95  
???  Cm    96  
???  Bk    97  
???  Cf    98  
???  Es    99  
???  Fm   100  
???  Md   101  
???  No   102  
???  Lr   103  
???  Rf   104  
???  Db   105  
???  Sg   106  
???  Bh   107  
???  Hs   108  
???  Mt   109  
???  Hydrogen		  1 
???  Helium		  2 
???  Lithium		  3 
???  Beryllium		  4 
???  Boron		  5 
???  Carbon		  6 
???  Nitrogen		  7 
???  Oxygen		  8 
???  Fluorine		  9 
???  Neon		 10 
???  Sodium		 11 
???  Magnesium		 12 
???  Aluminum		 13 
???  Silicon		 14 
???  Phosphorus	         15 
???  Sulfur		 16 
???  Chlorine		 17 
???  Argon		 18 
???  Potassium		 19 
???  Calcium		 20 
???  Scandium		 21 
???  Titanium		 22 
???  Vanadium		 23 
???  Chromium		 24 
???  Manganese		 25 
???  Iron		 26 
???  Cobalt		 27 
???  Nickel		 28 
???  Copper		 29 
???  Zinc		 30 
???  Gallium		 31 
???  Germanium		 32 
???  Arsenic		 33 
???  Selenium		 34 
???  Bromine		 35 
???  Krypton		 36 
???  Rubidium		 37 
???  Strontium		 38 
???  Yttrium		 39 
???  Zirconium		 40 
???  Niobium		 41 
???  Molybdenum	         42 
???  Technetium	         43 
???  Ruthenium		 44 
???  Rhodium		 45 
???  Palladium		 46 
???  Silver		 47 
???  Cadmium		 48 
???  Indium		 49 
???  Tin		 50 
???  Antimony		 51 
???  Tellurium		 52 
???  Iodine		 53 
???  Xenon		 54 
???  Cesium		 55 
???  Barium		 56 
???  Lanthanum		 57 
???  Cerium		 58 
???  Praseodymium	 59 
???  Neodymium		 60 
???  Promethium	         61 
???  Samarium		 62 
???  Europium		 63 
???  Gadolinium	         64 
???  Terbium		 65 
???  Dysprosium	         66 
???  Holmium		 67 
???  Erbium		 68 
???  Thulium		 69 
???  Ytterbium		 70 
???  Lutetium		 71 
???  Hafnium		 72 
???  Tantalum		 73 
???  Tungsten		 74 
???  Rhenium		 75 
???  Osmium		 76 
???  Iridium		 77 
???  Platinum		 78 
???  Gold		 79 
???  Mercury		 80 
???  Thallium		 81 
???  Lead		 82 
???  Bismuth		 83 
???  Polonium		 84 
???  Astatine		 85 
???  Radon		 86 
???  Francium		 87 
???  Radium		 88 
???  Actinium		 89 
???  Thorium		 90 
???  Protactinium	 91 
???  Uranium		 92 
???  Neptunium		 93 
???  Plutonium		 94 
???  Americium		 95 
???  Curium		 96 
???  Berkelium		 97 
???  Californium	 98 
???  Einsteinium	 99 
???  Fermium		100 
???  Mendelevium	101 
???  Nobelium		102 
???  Lawrencium	        103 
???  Rutherfordium	104 
???  Dubnium		105 
???  Seaborgium	        106 
???  Bohrium		107 
???  Hassium		108 
???  Meitnerium         109